Improvement in driving drums or pulleys



R. MAT'HEBS. I Driving Drums orPulleys.

No. 154,881. Patented Sept. 8,1874.

UNITED STATES PATENT OFFIcE.

ROBERT MATHERS, OF LEEDS, ENGLAND.

IMPROVEMENT IN DRIVING DRUMS OR PULLEYS.

Specification forming part of Letters Patent No. 154,881, dated September 8, 1874; application filed April 24, 1874.

To all whom it may concern:

Be it known that I, ROBERT MATHERS, of Leeds, in the county of York and Kingdom of England, engineer, have invented Improvements in the Construction of Driving-Drums, Strap-Pulleys, or.Riggers, of which the following is a specification:

My said invention has for its object improvements in the construction of driving-drums, strap-pulleys, or riggers, whereby greater facility is afforded for fixing and removal, and convenience of packing for transmission, combined with lightness, strength, and a more even balance, and with economy in first cost; and this object I attain by constructingapulley with a periphery of sheet iron or steel attached to a cast-iron frame, turned so that its periphery coincides exactly with a circle, in which are comprised the hub, arms, and rim, as ex plained hereafter, and as illustrated in the ac companying drawing, in which- Figure 1 is a side view of a pulley made in accordance with my improvement, half of the periphery being removed; Fig. 2, a transverse section, and Fig. 3 a detached view.

The frame, including the hub A, arms B, and narrow rim D, is made of cast-iron, and by preference in two parts, secured together in a manner rendered too' apparent by the drawing to need description. The broad rim or periphery G of the pulley is made of sheet iron or steel, and should be bent to a proper diameter by passing it while cold between suitably-arranged chilled rolls. This periphery is united at the ends in the manner shown in Fig. 3-that is, by two plates, 1 a," between which the narrow rim of the wheel fits snugly. These plates may be riveted to one end of the periphery, but should be secured to the other by bolts with heads adapted to countersunk holes, and the periphery may be secured to the narrow rim D of the frame by bolts at suitable intervals throughout the circumference of the pulley.

Wh en a pulley having a great width of driving surface is required, the wide periphery may be secured to two cast-iron frames of the character described. The driving-periphery may be made flat or rounding transversely by suitable rolls, the curvature and cold-rolling greatly increasing the rigidity, and improving the periphery as a driving-surface.

It should be understood that the narrow rim D of the cast-iron frameshould be turned so as to form a true base for the broader rim of sheet-iron.

I do not desire to claim, broadly, a pulley having a sheet-iron rim secured to a central frame; but

I claim as my invention- The within-described pulley, consisting of a central frame of cast-iron having a turned outer edge coinciding exactly with a circle,

and a broad rim or periphery, G, of rolled sheet-iron secured to said turned edge, as set forth.

In witness whereof I have signed my name to this specification in the presence of two sub-' scribing witnesses.

ROBERT MATHERS.

Witnesses:

WILLIAM WARD,

Solicitor, Leeds. EDWIN WM. BARTLEY, 23 Ney street, Leeds. 

